The last bastion of Roman presence north of the Alps looms over a German town.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The "Prussian Versailles" that is as glorious today as when it was built.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The most visited, and possibly most controversial, museum in Germany.

The fairy tale castle of the "fairy-tale king."

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Colorful and chaotic stacked hotel in North Holland.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Old Danish castle immortalized in Shakespeare's Hamlet.

Copenhagen's celebrated theme park and gardens.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.